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    <title>Document</title>
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  <body>
    <!-- 给一段文章中的全部指定词语进行过滤
// 比如我要过滤 "SM"

var str = 'asdasdSMasdasdasdSMsdasdasdSMsadasd'

// 需要结果
// asdasd**asdasdasd**sdasdasd** -->
    <script>
      var str = "asdasdSMasdasdasdSMsdasdasdSMsadasd";
      function fn(a, b) {
        var arr1 = a.split(b);
        var arr2 = arr1.join("**");
        console.log(arr2);
      }
      fn(str, "SM");
    </script>
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